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One simple approach is to create a period before bed when the phone is no longer being used.
Even reducing screen exposure for part of the final hour before sleep can help the mind begin slowing down.Writers Resources
Keeping the phone away from the bed can also reduce the temptation to check it during the night.
Instead of charging it on the bedside table, some people find it helpful to leave it across the room or in another nearby area.
Turning off unnecessary notifications can help as well.
If the phone must remain close for emergencies, using a do-not-disturb setting can reduce interruptions while still allowing important calls to come through.
Replacing scrolling with a calmer routine can make bedtime feel different too.
Reading a physical book, stretching, listening to quiet music, preparing clothes for the next day, or simply sitting in lower lighting can help signal to the brain that the day is ending.
The goal does not have to be eliminating phones completely.
For most people, that is unrealistic.